Threat Outbreak Alert

Summary

Cisco Security has detected significant activity related to Portuguese-language spam e-mail messages that claim to contain a payment invoice notification for the recipient. The text in the e-mail message attempts to convince the recipient to follow a link and view the details. However, the link directs the user to a malicious .zip file containing an .exe file that, when executed, attempts to infect the system with malicious code.

E-mail messages that are related to this threat (RuleID5488) may contain any of the following files:

Fatura-CobrancaFev.zipFatura-CobrancaFev.exe

The Fatura-CobrancaFev.exe file in the Fatura-CobrancaFev.zip attachment has a file size of 49,152 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x0ECE6A6016BA071B8C8441E3F9026F0F

The following text section is a sample of the e-mail message that is associated with this threat outbreak:

Cisco Security analysts examine real-world e-mail traffic data that is collected from over 100,000 contributing organizations worldwide. This data helps provide a range of information about and analysis of global e-mail security threats and trends. Cisco will continue to monitor this threat and automatically adapt systems to protect customers. This report will be updated if there are significant changes or if the risk to end users increases.

Cisco Virus Outbreak Filters protect customers during the critical period between the first exploit of a virus outbreak and the release of vendor antivirus signatures. E-mail that is managed by Cisco and end users who are protected by Cisco web security appliances will not be impacted by these attacks. Cisco appliances are automatically updated to prevent both spam e-mail and hostile web URLs from being passed to the end user.

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Cisco Threat Outbreak Alerts address spam and phishing campaigns that attempt to collect sensitive information or spread malicious software by using email attachments or by directing users to malicious sites. These alerts document threats that are active in the wild and provide SenderBase RuleIDs for mitigations; sample email messages; and names, sizes, and MD5 hashes of files.